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How could I tell what is listening on which ports on Ubuntu? In other words, how do I get a list of ports that are in use?

intcreator
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Genadinik
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1 Answers1

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"In use" as in with an active connection, or that programs are listening on? Or both?

Run sudo netstat -lp in your terminal; this will tell you what ports are open to receive connections, and what programs are listening on them. Try sudo netstat -p for the same thing, plus currently-active connections.

Kromey
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  • I think both is best ;) – Genadinik Apr 19 '11 at 17:57
  • What was a little strange is that I have tomcat and apache servers running and neither port 8080 nor 80 showed up in the list. Would you know why that would happen? – Genadinik Apr 19 '11 at 18:02
  • @Genadinik Verify what port they are configured to listen on; for Apache this is the Listen directive in its config file, but I don't know about Tomcat. – Kromey Apr 19 '11 at 18:06
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    fuser -n tcp 8080 will approach it from the other end; showing you which process (if any) is listening on TCP port 8080. – SmallClanger Apr 19 '11 at 18:12
  • If what Kromey suggested didn't cut it, try sudo netstat -tulpn. – Omid Ariyan Jul 14 '20 at 21:36
  • use ss now https://askubuntu.com/questions/1025568/has-netstat-been-replaced-with-a-new-tool – Nat Nov 20 '23 at 18:16